Effect of cycle duration on phosphorus and nitrogen transformations in biofilters

Shanableh, Abdallah; Abeysinghe, D. T.; Hijazi, Amal

doi:10.1016/s0043-1354(96)00230-8

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…Based on the intermittent aeration control, 33% of power consumption could be saved every day compared to continuous aeration systems. Besides, the I-BAF system was more eminent in nutrients removal when compared with other representative intermittent-aeration systems (Shanableh et al 1997;Chlou et al 2001;Zheng & Long, 2008). Therefore, the proposed I-BAF system was highefficiency, cost-saving and energy-efficient, which can be regarded as an alternative solution to simultaneous carbon and nutrients removal.…”

Section: Phosphorus Removalmentioning

confidence: 95%

“…Moreover, by reason of the gradient of dissolved oxygen (DO) from the interior to the exterior of the carrier, it is effective in removing carbon and nitrogen concurrently (Lemoine et al 2006;Rogalla et al 2006). In particular, phosphorus removal can be achieved in BAF systems operated under alternated anaerobic/aerobic conditions (Shanableh et al 1997;Zheng & Long, 2008). The phosphorus extraction depends on backwashes to discharge the phosphorus-rich attached biomass.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous nutrients and carbon removal from low-strength domestic wastewater with an immobilised-microorganism biological aerated filter

Chen

Tong

et al. 2011

Water Science and Technology

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To improve the efficiency of low-strength domestic wastewater treatment, an immobilised-microorganism biological aerated filter (I-BAF) was established for simultaneous carbon, nitrogen and phosphorus removal. The I-BAF performance was systematically evaluated under continuous and intermittent aeration modes. At the optimal condition with an intermittent aeration control schedule of 2 h on/1 h off, the maximum removal rates of COD, NH(4)(+)-N, TN and P were 82.54%, 94.83%, 51.85% and 61.49%, respectively, and the corresponding averaged effluents could meet the first class standards of China. Further analysis of PCR-DGGE profile revealed that members of the gamma and alpha proteobacterium bacterial groups were probably responsible for the nitrogen and phosphorus removal. The I-BAF system showed excellent performance in carbon and nutrients removal, which provided a cost-effective solution for the treatment of low-strength domestic wastewater.

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Section: Phosphorus Removalmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Simultaneous nutrients and carbon removal from low-strength domestic wastewater with an immobilised-microorganism biological aerated filter

Chen

Tong

et al. 2011

Water Science and Technology

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“…Substantial research has been done on designing bioreactors for denitrification (McCleaf and Schroeder, 1995; Reising and Schroeder, 1996; Shanableh et al, 1997). Most designs require a supplemental C source such as sucrose (Sison et al, 1995), ethanol [C 2 H 5 OH] or acetic acid [C 2 H 4 O 2 ] (Constantin and Fick, 1997), or methane [CH 4 ] (Thalasso et al, 1997) to be effective.…”

Section: Nitrogen Removal Strategiesmentioning

confidence: 99%

Nitrogen Management Strategies to Reduce Nitrate Leaching in Tile‐Drained Midwestern Soils

Dinnes¹,

Karlen²,

Jaynes³

et al. 2002

Agronomy Journal

645

290

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Balancing the amount of N needed for optimum plant growth while minimizing the NO3 that is transported to ground and surface waters remains a major challenge for everyone attempting to understand and improve agricultural nutrient use efficiency. Our objectives for this review are to examine how changes in agricultural management practices during the past century have affected N in midwestern soils and to identify the types of research and management practices needed to reduce the potential for nonpoint NO3 leakage into water resources. Inherent soil characteristics and management practices contributing to nonpoint NO3 loss from midwestern soils, the impact of NO3 loading on surface water quality, improved N management strategies, and research needs are discussed. Artificial drainage systems can have a significant impact on water quality because they behave like shallow, direct conduits to surface waters. Nonpoint loss of NO3 from fields to water resources, however, is not caused by any single factor. Rather, it is caused by a combination of factors, including tillage, drainage, crop selection, soil organic matter levels, hydrology, and temperature and precipitation patterns. Strategies for reducing NO3 loss through drainage include improved timing of N application at appropriate rates, using soil tests and plant monitoring, diversifying crop rotations, using cover crops, reducing tillage, optimizing N application techniques, and using nitrification inhibitors. Nitrate can also be removed from water by establishing wetlands or biofilters. Research that is focused on understanding methods to minimize NO3 contamination of water resources should also be used to educate the public about the complexity of the problem and the need for multiple management strategies to solve the problem across agricultural landscapes.

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“…In a surface attached-growth reactor, microbial cells grow on surfaces in the reactor, with organic substrates to be degraded being transported from the bulk liquid to the biofilm. Trickling filters and rotating biological contactors are the two better known examples of attached-growth reactors (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). Appropriate kinetic expressions for biomass accumulation and substrate utilization are then used to calculate the key design parameters for the reactor, such as the loading, suspension volume, and surface area for biomass attachment required for achieving the desired treatment efficiency (1,2,5,(10)(11)(12)(13)(14)(15)(16)(17)(18).…”

Section: Introductionmentioning

confidence: 99%

A Dual-Growth Kinetic Model for Biological Wastewater Reactors

Chang

Parulekar

Ahmed

2008

Biotechnol Progress

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Biological wastewater reactors are traditionally divided into two groups based on modes of cell growth: suspension and attached (biofilm) growth. Kinetic descriptions of these reactors are based on confining cell growth to solid surfaces or void space. Because suspended cells grow in void space and biofilms grow on surfaces, both forms of microbial growth must in principle occur in a biological reactor, unless the surface is inhabitable by a biofilm. Cell growth and substrate utilization in both modes, suspension and attached, are fully accounted for in the model developed here. Simulations based on this model show that biofilms growing on the walls of a reactor, classified as a suspension culture, can contribute substantially to the total organics removal. Similarly, suspended cells in the voids of a "traditional biofilm" reactor can contribute significantly to degradation of organic substrates. The presence of biofilms can obviate total washout of suspended cells and avert reactor failure. Model simulations enable a comparison of attached and suspended biomass in terms of biomass accumulation, substrate degradation, and effectiveness of substrate utilization and illustrate interactions between the two forms of biomass. The model provides a unified way to analyze and design biological wastewater processes.

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Effect of cycle duration on phosphorus and nitrogen transformations in biofilters

Cited by 13 publications

References 11 publications

Simultaneous nutrients and carbon removal from low-strength domestic wastewater with an immobilised-microorganism biological aerated filter

Simultaneous nutrients and carbon removal from low-strength domestic wastewater with an immobilised-microorganism biological aerated filter

Nitrogen Management Strategies to Reduce Nitrate Leaching in Tile‐Drained Midwestern Soils

A Dual-Growth Kinetic Model for Biological Wastewater Reactors

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